package com.example.novelweb.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.example.novelweb.constant.RedisConstant;
import com.example.novelweb.constant.UserConstant;
import com.example.novelweb.model.vo.UserVO;
import com.example.novelweb.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;


// refresh token and save userVO in threadLocal
public class RefreshTokenInterceptor implements HandlerInterceptor {

  private StringRedisTemplate stringRedisTemplate;
  public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
    this.stringRedisTemplate = stringRedisTemplate;
  }

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    // 1.获取请求头中的token
    String token = request.getHeader(UserConstant.HEADER_AUTH);
    // 没有token
    if (StrUtil.isBlank(token)) {
      // 放行到下一个拦截器
      return true;
    }
    // 有token:

    Set<String> set  =stringRedisTemplate.keys(RedisConstant.KEY_LOGIN_TOKEN +"*"+ token);
    // 2.3.判断用户是否存在
    if(set==null || set.isEmpty()) {
      return true;
    }

    String key = set.stream().iterator().next();
    Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);

    // 5.将查询到的hash数据转为UserDTO
    UserVO userVO = BeanUtil.fillBeanWithMap(userMap,new UserVO(),false);
    // 6.存在，保存用户信息到 ThreadLocal
    UserHolder.saveUser(userVO);
    // 7.刷新token有效期
    stringRedisTemplate.expire(key, RedisConstant.TTL_LOGIN_TOKEN, TimeUnit.MINUTES);
    // 8.放行
    return true;
  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    // 移除用户
    UserHolder.removeUser();
  }
}
